翅片参数对车用中冷器流动传热性能的影响

为了研究翅片结构及其几何参数对车用进气中冷器热力性能的影响,采用三维k-ε湍流模型,应用块结构网格生成技巧,融合流固耦合研究方法和薄壳导热模型数值模拟18个具有不同结构和参数的中冷器换热单元的流动传热性能.采用正交试验设计方法(DOE）安排仿真研究过程,进行极差分析和方差分析,并通过风洞实验进行验证.研究结果表明,翅片结构形式和峰距对传热性能影响巨大,翅高和扭幅次之；翅高对流动阻力的影响最为显著,扭幅和峰距次之；不必考虑扭动波长对热力性能的影响.研究结果与工程实践经验吻合,风洞实验验证了该方法的有效性.

The study of effects of fin parameters on thermal hydraulic performance of a vehicular charged air cooler

Numerical simulation method was adopted to investigate the effects of the fin structures and parameters on the thermal hydraulic performance in a charged air cooler (CAC). Three dimension k-ε turbulence model, block-structured grid and fluid-solid coupling method combined with shell conduction model were adopted and DOE (Orthogonal experimental design） method was used to simulate the fluid flow and heat transfer performances of 18 virtual geometry units. The range and variance analyses were carried out，and wind tunnel tests were used to validate the  effectiveness of the method. The investigation indicates the effects of fin structure and pitch on heat transfer performance are most notable, and those of the fin height and fin wavy amplitude follows, as for fluid flow resistance, the effect of fin height is most obvious, and those of the wavy amplitude and pitch are second to it. The effect of wavy length on performance can be ignored. The simulation findings validated by wind tunnel tests are consistent with engineering experiences.